Lucy had already completed the project when I arrived.改为一般疑问句
问题描述：
Lucy had already completed the project when I arrived.改为一般疑问句
答
Had Lucy completed the project yet when you arrived?
already常用于肯定句
yet常用于否定句或疑问句
答
Had Lucy already completed the project when you arrived?
答
Had Lucy completed the project yet when you arrived